package day07;

import java.util.Random;
import java.util.Scanner;

public class VerificationCode {
    public static void main(String[] args) {
        String a =  generateVeriCode(2);
        Scanner scan = new Scanner(System.in);
        System.out.println(a);
        System.out.print("请输入验证码:");
        String code = scan.next();
        if (a.equals(code)){
            System.out.println("验证成功");
        }else {
            System.out.println("验证码错误验证失败");
        }
    }

    public static String generateVeriCode(int len){
        String code ="";
        Random rand = new Random();
        char[] chs= {'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','B','Q','R','S','T',
                    'U','V','W','X','Y','Z','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o',
                     'b','q','r','s','t','u','v','w','x','y','z','0','1','2','3','4','5','6','7','8','9'
        };

        for(int i = 1 ; i<=len ; i++){
            int index = rand.nextInt(chs.length);
            code  += chs[index];
        }
        return code;
    }
}
